Response of Growth, Yield and Essential Oil of Geranium Plants to Surface Irrigation and Humic Acid Treatments

Water is among the most important factors affected growth, yield and quality of medicinal aromatic plants since its deficiency may cause serious growth harms losses. Egypt suffers from a scarcity water, so each drop should be preserved. Therefore, objective present study was to determine suitable irrigation treatment (120, 100 80% ETo (evapotranspiration) humic acid amounts (control), 1.0, 1.5 2.0 cm/L) that attain highest essential oil geranium (Pelargonium graveolens L. Herit Aiton) under surface in clay soil at El Kanater Khairiya. Results showed alleviated deteriorative effect water deficiency, where irrigated with 120% treated cm/L improved characters terms plant height, number branches, fresh, dry weights volatile yield. While, percentage proline content were recorded during two growing seasons. also applied 7192 m3/fed averaged over seasons attained The values use efficiency productivity 14.1 10.0 application acid. Thus, it can concluded required for ETo. However, could applied, which increase by 24%, compared